Change the "equals" in your iRule to "starts_with"
Change this: HTTP::redirect http://xpro.xx.tt/teste/tt/rr" target="_blank" rel="nofollow">http://xpro.xx.tt/teste/tt/rr
To this: HTTP::redirect http://xpro.xx.tt/teste/tt/rr
The Port Translation is set on the Virtual Server(checkbox), but happens in the Pool(when the servers are added to the pool, the port number is set). This means that the "Port Translation" Checkbox inside the Virtual Server must be checked and the Servers must be added into the pool like such:
10.10.10.10:50000
20.20.20.20:50000
So the Virtual Server should be on we'll say Port 80 and then all traffic is translated (by the BigIP) from 80 to 50000.
Let us know what results you get.